Content last revised on January 9, 2026
CR2L-300/UL | 300A 250V Super-Rapid Fuse for Industrial Power
An Engineering-Focused Overview
Optimized Protection for Semiconductor Circuits
The Fuji Electric CR2L-300/UL is a UL-recognized Super-Rapid Fuse designed for high-current semiconductor protection in industrial power systems. Rated at 300 A with a voltage of 250 V, it offers fast-acting overcurrent protection, safeguarding sensitive devices such as IGBTs, diodes, and power modules from excessive current. Its compact and robust construction ensures high reliability and consistent performance in demanding environments.
Application Scenarios & Value
System-Level Benefits in Industrial Power Systems
The CR2L-300/UL is ideal for protecting medium- to high-power semiconductor circuits. Key applications include:
- IGBT and diode module protection
- Industrial motor drives
- Welding power supplies
- DC power rectification systems
This Super-Rapid Fuse responds quickly to overcurrent events, minimizing potential damage and downtime. Its UL recognition (File No. E42949) simplifies compliance and safety certification for industrial equipment.
Key Parameter Overview
Decoding the Specs for Reliable Protection
| Parameter | Symbol | Value | Conditions |
|---|---|---|---|
| Rated Current | IR | 300 A | — |
| Rated Voltage | VR | 250 V AC | — |
| Breaking Capacity | IBS | 50 kA | AC, 50 Hz |
| Typical Response Time | t | 2–5 ms | 300 A Overcurrent |
| UL Recognition | — | File No. E42949 | — |
| Operating Temperature | Top | -40°C to +125°C | — |
Technical Deep Dive
Understanding Fast-Acting Fuse Protection
The CR2L-300/UL employs a super-rapid response design, optimized for semiconductor circuits where fast current interruption is critical. The fuse element melts almost instantaneously under overcurrent conditions, preventing excessive stress on downstream components. Its robust encapsulation and UL-recognized construction guarantee safety, minimal leakage, and consistent performance across industrial environments.
Frequently Asked Questions
Engineering Inquiries on the CR2L-300/UL
Why choose a Super-Rapid Fuse over a standard fuse?
Super-Rapid Fuses react within milliseconds to overcurrent events, protecting sensitive semiconductor devices that could otherwise fail under slower-acting fuse conditions.
Can the CR2L-300/UL be used in high-power welding systems?
Yes, its fast response and 300 A rating make it suitable for welding power supplies where high pulse currents occur frequently.
How does UL Recognition benefit system integrators?
UL Recognition ensures independent verification of performance and safety, simplifying certification for industrial applications, especially in North America.
Strategic Outlook
Ensuring Reliable Semiconductor Protection
Industrial power systems increasingly rely on high-speed, high-current semiconductor devices. The Fuji Electric CR2L-300/UL provides engineers with a proven, reliable fuse solution to protect critical components, minimize downtime, and maintain system efficiency. Its combination of fast response, high current rating, and UL certification makes it a cornerstone in industrial power safety.